mips, uasm: Enable muhu opcode for MIPS R6

Enable the 'muhu' instruction, complementing the existing 'mulu', needed
to implement a MIPS32 BPF JIT.

Also fix a typo in the existing definition of 'dmulu'.
Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com>
Signed-off-by: Johan Almbladh <johan.almbladh@anyfinetworks.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211005165408.2305108-2-johan.almbladh@anyfinetworks.com

arch/mips/include/asm/uasm.h

@@ -145,6 +145,7 @@ Ip_u1(_mtlo);
 Ip_u3u1u2(_mul);
 Ip_u1u2(_multu);
 Ip_u3u1u2(_mulu);
+Ip_u3u1u2(_muhu);
 Ip_u3u1u2(_nor);
 Ip_u3u1u2(_or);
 Ip_u2u1u3(_ori);

arch/mips/mm/uasm-mips.c

@@ -90,7 +90,7 @@ static const struct insn insn_table[insn_invalid] = {
 				RS | RT | RD},
 	[insn_dmtc0]	= {M(cop0_op, dmtc_op, 0, 0, 0, 0), RT | RD | SET},
 	[insn_dmultu]	= {M(spec_op, 0, 0, 0, 0, dmultu_op), RS | RT},
-	[insn_dmulu]	= {M(spec_op, 0, 0, 0, dmult_dmul_op, dmultu_op),
+	[insn_dmulu]	= {M(spec_op, 0, 0, 0, dmultu_dmulu_op, dmultu_op),
 				RS | RT | RD},
 	[insn_drotr]	= {M(spec_op, 1, 0, 0, 0, dsrl_op), RT | RD | RE},
 	[insn_drotr32]	= {M(spec_op, 1, 0, 0, 0, dsrl32_op), RT | RD | RE},
@@ -150,6 +150,8 @@ static const struct insn insn_table[insn_invalid] = {
 	[insn_mtlo]	= {M(spec_op, 0, 0, 0, 0, mtlo_op), RS},
 	[insn_mulu]	= {M(spec_op, 0, 0, 0, multu_mulu_op, multu_op),
 				RS | RT | RD},
+	[insn_muhu]	= {M(spec_op, 0, 0, 0, multu_muhu_op, multu_op),
+				RS | RT | RD},
 #ifndef CONFIG_CPU_MIPSR6
 	[insn_mul]	= {M(spec2_op, 0, 0, 0, 0, mul_op), RS | RT | RD},
 #else

arch/mips/mm/uasm.c

@@ -59,7 +59,7 @@ enum opcode {
 	insn_lddir, insn_ldpte, insn_ldx, insn_lh, insn_lhu, insn_ll, insn_lld,
 	insn_lui, insn_lw, insn_lwu, insn_lwx, insn_mfc0, insn_mfhc0, insn_mfhi,
 	insn_mflo, insn_modu, insn_movn, insn_movz, insn_mtc0, insn_mthc0,
-	insn_mthi, insn_mtlo, insn_mul, insn_multu, insn_mulu, insn_nor,
+	insn_mthi, insn_mtlo, insn_mul, insn_multu, insn_mulu, insn_muhu, insn_nor,
 	insn_or, insn_ori, insn_pref, insn_rfe, insn_rotr, insn_sb, insn_sc,
 	insn_scd, insn_seleqz, insn_selnez, insn_sd, insn_sh, insn_sll,
 	insn_sllv, insn_slt, insn_slti, insn_sltiu, insn_sltu, insn_sra,
@@ -344,6 +344,7 @@ I_u1(_mtlo)
 I_u3u1u2(_mul)
 I_u1u2(_multu)
 I_u3u1u2(_mulu)
+I_u3u1u2(_muhu)
 I_u3u1u2(_nor)
 I_u3u1u2(_or)
 I_u2u1u3(_ori)